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Function: _error_handler
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Function: _error_handler
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Filename: database/translate.php
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File: D:\database\translate.php
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Function: _error_handler
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Function: lang
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File: D:\database\translate.php
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Function: _error_handler
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File: D:\database\translate.php
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Function: _error_handler
File: D:\wwwroot\jzbearing.com\application\views\news\knowledgePage.php
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File: D:\database\translate.php
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Function: _error_handler
File: D:\wwwroot\jzbearing.com\application\views\news\knowledgePage.php
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2024-11-23
Severity: Notice
Message: Use of undefined constant APP_ID - assumed 'APP_ID'
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File: D:\database\translate.php
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Function: _error_handler
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Function: _error_handler
File: D:\wwwroot\jzbearing.com\application\views\news\knowledgePage.php
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Function: require_once
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File: D:\database\translate.php
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Function: _error_handler
File: D:\wwwroot\jzbearing.com\application\views\news\knowledgePage.php
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目前使用比较广泛的是丁腈橡胶与氟橡胶材料，前者成本低廉，但耐温与密封性能较差，泄漏情况比较严重;后者的耐温性与密封性有明显改善，但成本较高，且仍具备普通橡胶材料的某些不良共性：如耐磨性能差、使用寿命短、对轴的偏心反应特别敏感等，泄漏现象仍比较普遍。
填充聚四氟乙烯(PTFE)油封代替唇形橡胶油封，成功解决了橡胶骨架油封漏水、漏油问题。
一、聚四氟乙烯油封材质优点
聚四氟乙烯(PTFE)又名铁氟龙或塑料王，是四氟乙烯单体的共聚物，它具有下列优点：
(1)化学稳定性：几乎所有的化学抗性，强酸、强碱或强氧化剂及有机溶剂等对它均不起作用。
(2)热稳定性：裂解温度在400℃以上。因此，聚四氟乙烯能够在-200℃～300℃温度范围内正常工作。
(3)减摩性：聚四氟乙烯材料磨擦系数极低，仅0.02，是橡胶的1/40。
(4)自润滑性：聚四氟乙烯材料表面具有突出的自润滑性，几乎所有粘性物质均不能粘附到它的表面上去。
二、聚四氟乙烯油封填充改性
纯聚四氟乙烯不耐磨，要使它具有实用性，必需对它填充改性处理。我们采用二种方法：一种是无机物填充改性，在聚四氟乙烯里加入玻璃纤维、碳素纤维、石墨、二硫化钼等。另一种是有机物填充改性，在聚四氟乙烯里加入聚苯脂、聚苯硫醚等(适用于净水、食品，药品密封)。通过填充改性使聚四氟乙烯耐磨性能提高了2000倍，又增加了钢性、导热性，使油封达到高寿命要求。
三、聚四氟乙烯密封原理
聚四氟乙烯油封唇口在加工时被拉成喇叭状，由于聚四氟乙烯经拉制后具有记忆收缩能力，在工作中产生的摩擦热使唇口会不断收缩，所以不需要弹簧的帮助，它会紧紧抱在轴上，不让它与轴表面有间隙存在，又能补偿磨损。
四、聚四氟乙烯油封优点
聚四氟乙烯(PTFE)油封与橡胶油封比较有以下优点：
1、橡胶油封采用弹簧压紧的尖唇口，与轴接触面宽仅为0.3—0.5mm聚四氟乙烯油封采用无弹簧的宽唇动力结构，与轴接触面宽为5—7mm，这样可以保持一个足够的油膜，而且对轴的偏心不敏感，在径向跳动0.4mm工况下仍可正常工作。
2、聚四氟乙烯油封内壁刻有与轴转向相反的螺纹槽，当轴旋转时会产生一个向内推力，阻止流体外流。这个推力很高，致使能封住1.0MPa(单唇)，3MPa(双唇)流体的压力，橡胶油封仅为0.03MPa。
3、聚四氟乙烯油封极佳的抗磨擦性,特别适用于无油或少油状态工作，即使长期停机后再度启用,也能立即拥有低磨擦特性。
4、聚四氟乙烯油封特别适用于高速旋转应用，速度可达30m/s。
5、聚四氟乙烯油封可做到无泄漏。
五、聚四氟乙烯油封应用
聚四氟乙烯油封主要应用在空压机、发动机、齿轮箱、马达、泵、空调、搅拌机、自动化精密机械、机器人、化学处理设备、制药和食品加工设备等等，特别适用于传统橡胶油封无法满足的应用。
六、聚四氟乙烯油封安装要求
聚四氟乙烯油封安装及安装部位的设计可参照NOK油封VAJ型或CFW-Simmerring油封B2PT型。
聚四氟乙烯油封是一种技术含量较高的产品。
来源：网络
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Severity: Notice
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Backtrace:
File: D:\database\translate.php
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Function: _error_handler
File: D:\wwwroot\jzbearing.com\application\views\news\knowledgePage.php
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Function: lang
File: D:\wwwroot\jzbearing.com\application\controllers\news.php
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Function: _error_handler
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File: D:\database\translate.php
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Function: _error_handler
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File: D:\database\translate.php
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Function: _error_handler
File: D:\wwwroot\jzbearing.com\application\views\news\knowledgePage.php
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File: D:\database\translate.php
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Function: _error_handler
File: D:\wwwroot\jzbearing.com\application\views\news\knowledgePage.php
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Function: _error_handler
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Hangzhou Jingzhou Bearing Co.,Ltd.
Address：Liangzhu Indystrial City Hangzhou
Service hotline：0571-88777186 88777665
Jiangsu Jingzhou Bearing Co., Ltd.
Address：No.19, Yulan Avenue, Xuyi Economic DevelopmentZone, Huai’an City, Jiangsu Province
Service hotline：0517-80817777
Website：www.jzbearing.com
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